Prefabricated double wall structure



P 7, 9 E. e. STACK 2,448,926

PREFABRICATED DOUBLE WALL STRUCTURE Filed Oct. 8. 1943 2 Sheets-Sheet 1 a t A I M N\. law

"I "w I- Q} I l I E- G. STACK PREFABRICATED DOUBLE WALL STRUCTURE Sept. 7, 1948.

2,5heets-Sheet 2 Filed 00;. s. 1945 Fig.9.

Patented Sept. 7, 1948 UNITED STATES PATENT OFFICE PREFABRIGATED noUBLc-wALL STRUCTURE Emmet e. Stack,Marshfield,reg. Application October 8, 1943, Serial lNo.-505,565

1 Claim. (01. co -2) My invention relates to the construction of prefabricated double wall panels, particularly those in structures often called igloos, with or without insulation between said walls.

The objects of my invention are to be able to assemble and disassemble these structures more easily and inexpensively, to provide better appearance, and to conserve material.

How these objectives are accomplished is hereinafter minutely described and illustrated in the accompanying drawings.

Fig. 1 of the drawings is a vertical sectional elevation on line [-1 of Fig. 2; Fig. 2 is a partial side elevation of a structure with rib fastenings on the exterior; Fig. 3 is an isometric section thru joining ribs on line 3-3 of Fig. 1; Fig. 4 is a horizontal section on the line 44'of Fig. 2, which shows how the side wall may bejoined to the end wall; Fig. 5 is a sectional elevation which shows the lapping of the rib sections; Fig. 6 -is an enlarged vertical section thru the ridge; Fig. 7 is an enlarged vertical section which shows how the side wall may be joined to the floor; Fig. 8 is an enlarged side elevation of Fig. '7; Fig. 9 is a horizontal section thru side wall panels which shows the rib fastenings on the exterior; Fig. 10 is a horizontal section thru side wall panels which shows the rib fastenings on the interior.

Thruout the drawings and the specifications similar numerals refer to similar parts.

Fig. 1 shows a cross section thru a semi-circular ribbed structure. Structures having semicircular or Gothic arched ribs are commonlycalled igloos since they came into use for housing troops in the north. In general these structures comprise a plurality of floor sections which support a plurality of curved wall sections or panels together with end walls which serve to complete the enclosure of the desired shelter.

The first buildings of the above type had ribs formed of steel sections and covered with corrugated iron. When the war spread to the Arctic and to the tropics there came a demand for insulated buildings and. as a result IWOOd ribs covered with plywood or synthetic materials came into use. Insulated buildings call for double walls with insulation of some sort between said walls.

It was and is very desirable to build the panels which comprise an igloo in the shop ready for assembly. Many ways have been devised to fasten the panels together in the field. For instance, holes were cut in the interior lining for tthe insertion of bolts and afterwards covered in the field. Since several hundred bolts were reuuired in the average igloo the interior was 2 prettywell pocke nark-ed and presented an unsightly appearance; .It is also a costly opera.- tion to cutthese holes and to cover them and it is also costly to remove thepatches when it is -desired-to disassemble the igloo! I I How .1 overcame the many difficulties encountered willnow be described. 1

The floor sections are constructed in .the usual manner with the joists 2, headers 3, and the floor 4, and are secured to oneanother by the. bolts 5 in the holes 6. I V

. The :curved wall section fl consists oftwo sun}- ilar portions -8 and -8 joined together at the ridge 9 by the bolts 10 and .to the floor sections 1 by the-lag screws 1 l.

Each curved wall section comprises two or more ribs, the drawingsshow three designated as 12, I,'2,-gand 13., on the outside of which is the coy-er ing M of any suitable material and on the inside of which is the lining l5 of -any suitable material. Between theouter covering 14 and the inner lining [5 may be positioned any suitable insulating material Hi.

The ribs l2, l2, and I3, are built up of short pieces of wood or other suitable material lapped as shown in Figs. 1, 3, and 5, and glued together. The rib I3 is built up of two courses I! of like width and of the same width as the narrow course I! of the rib l2. The rib I2 is built up of a narrow course H and a wide course IS. The pieces I9 'of the narrow course I! and the pieces 20 of the wide course l8 are lapped to break joints in order to strengthen the rib. In Figs. 1, 3, and 5, the joint 20 between the pieces [9 is spaced approximately midway between the joint 2| be.- tween the pieces 20 of the wide course l8. The inner lining I5 is shown secured to one edge of the narrow course 11 of the ribs l2, l2, and I3, and the outer covering [4 to the opposite edge of said course. In Fig. 9, the wide course I8 is shown to project beyond the outer covering l4, while in Fig. 10, it is shown to project beyond the inner lining l5. Thru that portion 22 of the wide course 18, which projects beyond either the outer covering II or the inner lining l5, are passed the bolts 23 which secure adjacent curved wall sections together. It is apparent that these bolts 23 may be inserted in their holes 24 or removed therefrom without disturbing either the outer covering 14 or the inner lining l5 in any manner, and that the covering l4, lining I5, and insulation l6, may be applied in the shop which they could not be when the fastening bolts were positioned between the covering and the lining unless holes were provided in the lining to insert or remove said bolts.

The ribs l2, l2, and I3, are secured to the floor shoe 5 dadoed and relished to receive them as shown in Figs. 7 and 8. This shoe 25 may be rabbeted on either one or both sides but the Figs. 7 and 8 show it rabbeted on only one side to form the shoulder 26 against which is positioned the inner lining l5. Incidentally the rabbet 21 for the lining I5 is made of sufficient width to provide an extended portion 28 which projects he 1 yond said inner lining to permit the lag screws II, which secure the curved wall sections" to the floor sections I, to be inserted and removed without disturbing the inner lining l5.

The ridge 9 is dadoed and relished to receive the upper ends of the ribs [2, l2, and .I.3-, and the .In a curved double wall structure, adjacent panels having adjacent ribs each including two 3 courses of boards glued together side by side, one

course being of greater width than the other and each course built up of short sections disposed end to end, those in one course overlapping those in the other to'break joint therewith, each panel top side of the ridge piece is rabbeted to form the extended portion 29 which projects beyond the outer covering 14 so that the bolts II), which hold opposite curved wall portions 8 together, may be inserted or removed without disturbin the outer covering I4 if the construction shown in Fig. 9, is used or without disturbing the inner lining 15 if the construction shown in Fig. 10 is used. The inner lining I5 is shown in Fig. 6, secured to the bottom side9A of the ridge 9 and the outer covering Hi to the bottom face 30A of the rabbet 30 of the ridge 9. The figures show the covering l4 and the lining l5 nailed to the ribs, shoe, and ridge. Unless the lining and covering is glued to the ribs, the covering 14 should be bedded in mastic at 3| before nailing to the above mentioned members. I have found sponge rubber 32 a very satisfactory seal between the wall sections and at the ridge.

Fig. 4 shows the curved wall section I joined to the end wall 33 by the facia 34 thru the instrumentality of the bolts 35 and 36.

Many of the igloos built by others and by myself have been set up up in the Arctic and other also having an outer covering secured to the outer face of its mentioned rib and an inner lining secured to the opposite face thereof with the narrow course of the rib forming a spacer between said lining and the covering, and means to secure together the wide courses of adjacent ribs.

EMMET G. STACK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,249,011 Bossert Dec. 4, 1917 1,337,745 Bassett Apr. 20, 1920 1,526,278 Gilmore Feb. 10, 1925 2,172,093 Thompson et a1 Sept. 5, 1939 2,351,209 Hobbs June 13, 19 14 FOREIGN PATENTS Number Country Date 492,722 France Mar. 31, 1919 

